<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button>点我去b页面</button>
    <script>
        localStorage.clear();
        let arr = [1, 2, 3, 4, 5];
        localStorage.setItem('arr', JSON.stringify(arr));


        let btn = document.querySelector('button');
        btn.addEventListener('click', function() {
            location.assign('./b.html')
        })
    </script>
</body>

</html>